Removable nozzle spray gun



March 6, 1951 J. o. ANDERSSON REMOVABLE NOZZLE SPRAY GUN Filed Feb, 12, 1948 Patented Mar. 6, 1951 UNITED STATES PATENT OFFICE 2,544,123 REMOVABLE NOZZLE SPRAY GUN John Olle Andersson, Ektorp, Sweden Application February 12, 1948, Serial No. 7,871 In Sweden January 27, 1944 4 Claims. (Cl. 299-441) This invention relates to spray guns of the type provided with nozzles for a coating composition and for air mounted on a handle.

The object of the invention is to provide an improved arrangement of the composition and air nozzles permitting of a rapid exchange of nozzles for various purposes and of taking the nozzle device apart for the purpose of cleaning the same.

The invention is principally distinguished by the feature that the coating composition and air are supplied to the nozzles through separate channels which are connected to corresponding passages or passage systems in a nozzle nipple, which is removably arranged on a nozzle holder extending from the handle, and on which the composition and air nozzles are exchangeably mounted.

The invention will be described with reference to the accompanying drawings, which illustrate preferred embodiments of a nozzle arrangement according to the invention.

Fig. l is an axial section through the nozzl holder extending from the handle and the nozzles arranged thereon according to an embodiment ofthe invention;

Fig. 2 is a cross section on and Fig. 3 shows a modified construction of the nozzle arrangement.

In the construction shown in Fig. l, the nozzle nipple carrying the nozzles for the coating composition and for the air is divided into two sleeveshaped members 2!, 22, the outer oneof which, i. e. the sleeve 22 provided with a hexagonal head 5, being threaded onto the outer end of the internal sleeve 2!, which is in turn threaded with the inner end thereof into the nozzle holder I, and being so arranged that the centre bore 8 thereof communicates with the supply passage 2 for the coating composition. The object of this construction of the nozzle nipple is to render possible efficient tightening of the connection of the line 22 in Fig. 1;

nipple to the passage 2 as well as to the air passage 3. The tightening effect against the passage 2 is brought about by the feature that the internal sleeve 2! is provided with a collar 23 formed into a nut head, said collar bearing tightly at,24, against a plane surface on the end of the nozzle holder 5. The coating composition is prevented irom being pressed out between the threads 25 to the annular space I provided in the outer end of the nozzle holder, said space haying the air passage 3 opening into the same. Similarly, a tight connection of the nozzle nipple 2 to the air passage 3 is obtained by the feature that the outer sleeve 22 is adapted by means of the nut head 5, andindependently of the internal sleeve 2|, to be set against a plane surface 26 on the end of the nozzle holder i, so that air cannot leak out at this point. The air passages H in the outer sleeve 22 of the nozzle nipple communicate with the air passage 3 through a recess 21 in the nut head 5 corresponding to the recess l5.

Then nozzle 6 for the coating composition is screwed into the nozzle nipple, that is to say, in this case into the outer sleeve 22 of the nozzle nipple, a tightening connection to the passage 8 being obtained by the fact that the nozzle is provided with a collar 28 formed into a nut head, said collar being set against the plane end of the sleeve 2 [to tighten thereagainst in the screwingin operation. The needle valve I6 is adapted to bear with its conical end portion against the inner end of the nozzle 6, for the purpose of cutting off the composition supply. The valve seat is thus located at the inner end of the passage extending through the nozzle. This arrangement has the advantage that the valve seat can be made independent, with respect to the position and size thereof, so that varying widths of the exit opening of the nozzle can be obtained. Thus, when another nozzle having a different exit opening is inserted, the same needle valve It may still be used, said needle valve then co-operating with a valve seat having the same width in all nozzles and being situated at the inner end of the nozzle.

Furthermore, the arrangement has the advantage that the needle valve can be made slightly tapering from the valve seat toward the point thereof, so that a greater degree of Vernier adjustment is obtained. I

A further improvement consists in that the air nozzle 1, II is adjustable in the axial direction relatively to the nozzle 6 for the coating composition. To this end, the air nozzle is divided into two parts, one I I being provided with the air passages l2 and formed into a nut and being threaded onto the nozzle 6, whereas the sleeveshaped member 1 is threaded onto the outer sleeve 22 of the nozzle nipple. By turning the member ll relatively to the nozzle 6, the air nozzle may thus be displaced axially outwards or inwards to render possible a suitable adjustment of the air passages l2 relatively to the jet ejected from the composition nozzle. The adjustment of the member I I having been effected, the sleeve 1 is set against the inside of said member to provide an outward tightening of the intermediate space I 2. To provide for a good tightening efiect, a packing ring 29 is interposed between the end portion of the sleeve 7 and the member H. The sleeve 1' having been set against the member II, it is locked in position by the nut 9, an efficient tightening effect being obtained at the same time, which will prevent air from leaking out along the threads 30. Fig. .1 shows the air'nozzle screwed into its innermost extreme position.

The adjustment of the air nozzle ll relatively,

to the composition jet has for its object to render possible different eifects in the squirting-of fithe composition. When the air nozzle ll isrremoved, so that the air jets escaping fromthe' passagesl'2 are caused to hit the composition jetiat a greater distance from the mouth of the composition nozzle, the composition jet is atomized ina lesser degree so that a greaterconcentration of'the 'filamentary composition particles on the surface adapted to receive same is obtained. On the dther hand, when'the air nozzle is screwed into positiomgreater spreading of the atomized composition jet is obtained, inasmuch as the air jet escaping through the passages IZwill then hit the composition jet nearer to the mouth of the composition nozzle, the jet being thus atomized into greater particles and being deposited in the form offilamentary splashes on the object receiving the composition. This adjustment of the air nozzle relatively to the composition'nozzle is of particular importance in the use of comparatively viscous compositions. With the-use of compositions of greater liquidity'the formation of splash may also be obtained toa'certain extent by a regulation "of the air nozzle relatively to the composition nozzle. I

'The embodiment shown in Fig. 3 differs from the construction according toFigs. 1 and'2 only by the formation of the member II of the air nozzle containing the air passages, in that said member'isprovided with a central portion formed in'toa nozzle 3|, said central portion having the nozzle 6 opening into the same. In this case, too,'the member I! may be adjusted axially with respect' to-the nozzle'6 by being screwed inwardly and outwardly on the nozzle 6, the sleeve 1 being then, as in Fig.1, set against the member I after the adjustment thereof has been efiected. In the drawing, the air nozzle H is shown in its innermost position, the inner'edge of the bore 32 in the-nozzle 3| abuttingagainst the end of the nozzle 6.

The embodiment according to Fig. 3 isparticularly intended for splash squirting, a piece of yarn being clamped between the nozzles 6 and 3|, 'for'thepurpose of obtaining larger composition particles.

What I claim is:

"1. Aspray gun, comprising in combination, a nozzle holder; a central 'nipplemember screwed .into saidnozzle holder and having a paint channel andafirst tightening .collar; a sleeve-shaped nipple member screwed on said central nipple member and having .air channels and a second tightening collar; tightening surfaces on the end of said nozzle holder opposite said tightening collars; a paint nozzle screwed into said central nipple member; an air nozzle screwed on the end of said paint nozzle and having air passages; and means forming an air-tight connection between said air passages and said air channels in said sleeve-shaped member.

2. A spray gun, comprising in combination, a

."of said nozzle holder opposite said tightening collars; alpaint nozzle screwed into said central nipple member; an air nozzle screwed on the end 'ofesaid paint nozzle and having air passages; means "forming an air-tight connection between said airpassages and said air channels in said sleeve-shaped member, said air-tight connection including a sleeve screwed on said sleeve-shaped nipple member; and tightening means arranged between said air nozzle and said sleeve.

3. A spray gun comprising in combination, a nozzle holder; a two-part nozzle nipple including a central paint-carrying nipple member screwed into said nozzle holder and a sleeve-shaped nipple member screwed on said central nipple member; air channels extending through said nozzle nipple; a paint nozzle screwed into said central nipple member; an air nozzle screwed on the-end of said paint nozzle; and means forming an air-tight connection between said air nozzle and said "nozzle nipple.

4. "A spray gun comprising in combination a nozzle holder; a two-part nozzle nipple including a'centralipaint carrying nipple member screwed into'said nozzle holder and a sleeve-shaped nipple member screwed on said nipple member; air channels extending through said nozzle nipple; a paint nozzle screwed into said central nipple member; an air nozzle screwed to and displacea-ble lengthwise of said paint nozzle; a sleeve screwed on said sleeve-shaped nipple member and enclosing an'air space formed between said sleeve and "said paint nozzle; air passages in said air nozzle communicating through said space with said air channels in said nozzle nipple; and tightening means arranged between said air nozzle and said sleeve.

JOHN OLLE ANDERSSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 451,784 Upson et a1 May 5, 1891 1,349,154 'Holton Aug. 10, 1920 1,547;349 Reichenbach July 28, 1925 1,586,009 Shelburne May 25, 1926 1,767,462 Lammert et al. June 24, 1930 1,876,643 Downs Sept. 13, 1932 FOREIGN PATENTS Number Country Date 347,452 Germany Jan. 20, 1922 416,235 France Aug. 2, 1910 

